Rev version to 2.7.  Add new Key constructor. Fix up some broken Javadoc links
Remove overlength Key constructor - replace with new changeMaximumSize method.
Renamed method to setMaximumSize.
Add a Javadoc comment
merge pbeaman: Add constructor for com.persistit.Key that allows an oversized backing byte array.

https://code.launchpad.net/~pbeaman/akiban-persistit/allow-long-keys/+merge/154814